A short hydrophobic peptide conjugated 3,5- disubstituted pyrazoles as antibacterial agents with DNA gyrase inhibition
作者:Nagendra Chowdary B.、Habbanakuppe D. Preetham、Santosh Kumar Verma、Vivek K. Hamse、M. Umashankara、Niranjan Raj S.、K. Pramoda、Kothanahally S. Sharath Kumar、G. Selvi
DOI:10.1016/j.molstruc.2022.134661
日期:2023.3
Antimicrobial peptides (AMP) are found in majority of living organisms. Their mode of action is unique and different from the conventional antibiotics. Though several classes of antimicrobial peptides have been studied, their mechanism of action against microbes is not yet clearly understood, otherwise it would open up a solid background for further development of new pharmaceutical compounds. The
大多数活生物体中都含有抗菌肽 (AMP)。它们的作用方式是独特的,不同于传统的抗生素。尽管已经研究了几类抗菌肽,但它们对微生物的作用机制尚不清楚,否则将为进一步开发新的药物化合物提供坚实的背景。目前的工作描述了肽-吡唑缀合物的抗菌活性的合成和评价。评估了这些缀合物针对革兰氏阳性和革兰氏阴性细菌菌株的抗菌效力,发现与单独的肽和简单的吡唑化合物相比,肽-吡唑缀合物的抗菌效力增强。分子对接研究表明,配体PH3、PH4、PH10对关键蛋白质非常有效。化合物PH3、PH4和PH10在 DNA 促旋酶的假定结合位点附近结合,对接得分为 -6.54、-8.2 和 -7.09 kcal/mol。
SYNTHESIS AND ANTI-MICROBIAL ACTIVITIES OF 1,3,5-TRISUBSTITUTED-PYRAZOLE DERIVATIVES CONTAINING A PYRIDYL MOIETY
Claisen condensation of ethyl isonicotinate with different acetophenones gave the corresponding pyridyl-beta-diketones, while the treatment with hydrazine hydrate yielded 3,5-disubstituted-1H-pyrazoles, which then converted 1,3,5-trisubstituted-pyrazole derivatives containing a pyridyl moiety by N-acylation with acyl chloride. The structures of all newly synthesized compounds are established by FTIR, H-1 NMR, mass spectroscopy and elemental analysis, and in the case of compound 2e, analyzed by single-crystal X-ray diffraction further. The anti-microbial activities of the title compounds have been tested by disc diffusion method against Escherichia coli, Staphylococcus aureus, Pyricularia oryzae and Rhizoctnia solani. The results showed that compounds 3c and 4c exhibited good inhibitory activity against all the tested organisms.
Substituent regulated photoluminescent thermochromism in a rare type of octahedral Cu<sub>4</sub>I<sub>4</sub> clusters